“It is the ethos of the Tribunal system and certainly that of the Tax Chamber of the First-tier Tribunal that a taxpayer can bring an appeal to a tax-expert Tribunal without the expense of instructing representatives. The Tribunal hearing a substantive appeal will be expert: it will know the law and will take the legal points at the hearing that an unrepresented appellant may not. Where the appellant is unrepresented the Tribunal panel will take on a more inquisitorial role and will ask witnesses questions which an unrepresented Appellant may not think to ask.”